| 摘要 |
PROBLEM TO BE SOLVED: To enhance a low sound range by overcoming the problem with a system, wherein a sound pressure of a small driver is fundamentally low, and absolute volume of the low sound range is weak, or the like, in reproducing the low sound range. SOLUTION: An earphone 1 includes a drum 5 having a drum-shaped casing 2, a front head 3 located on a front part of a back and front direction of the casing 2, a rear head 4 located on a rear part of the back and front direction of the casing 2 and an inner-drum space 5a defined by the casing 2, the front head 3 and the rear head 4 and a driver unit 6 having an external sound conducting part 6a and an internal sound conducting hole 6b in the drum 5. By making the front head 3 and the rear head 4 resonate in response to driving by the driver unit 6, and by outputting low pitch sounds B and C in addition to a full range sound from the external sound conducting part 6a, the minimum resonance frequency is lowered and the sound pressure is increased. COPYRIGHT: (C)2011,JPO&INPIT |
